have "dark-ish brown" streaks in my stool?

I'm in my early 60's and today and a week ago, I had these dark-ish brown streaks in my stool...the stool itself was a "regular" color.. but there were streaks of dark-ish brown streaks....I'm assuming this is not normal? is this blood? also how likely is it that it's cancer? or any other conditions? please help and thank you for your time